concepts

• Head

  • Head is a pointer to the current commit

• Featch

  • When fetching, git creates a new branch called 'remotes/<remote>/<branch>' and gets the changes from the remote branch

• Fast forward merge

  • When there is a clean commit history without any conflicts, it's a fast forward merge

• Submodules

  • Sub modules only tracks the remote repository and the head pointer
  • When the head pointer changes, the root repository will show that the sub module has been changed
  • Git will never change a sub module for you